Across
- 2. how fast light travels
- 4. electromagnetic waves with longer wavelengths
- 6. large cloud of gas and dust
- 7. collects light for better observation
- 9. electromagnetic waves that are very high energy
- 10. unifying scientific explanations
- 13. the distance between two corresponding points
- 15. rational center of a huge galaxy
- 17. used in astronomy as a standard unit
- 18. electromagnetic waves with very high energy
- 19. change in wavelength that allows us to determine if an object is moving
- 20. radio waves with long wavelengths
- 21. beginning point
Down
- 1. an object with more than four masses
- 2. areas of stars that spread from the center
- 3. a galaxy with a bright center
- 5. ___shaped galaxy,a galaxy with a bulge
- 8. the death of a large star by explosion
- 11. a representation of an object
- 12. all space and the matter space contains
- 14. provide us with visible light
- 16. the transfer of energy through matter